This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A284804 #6 Apr 05 2017 05:37:21 %S A284804 10,15,20,25,30,250,280,310,340,370,400,465,495,525,555,585,615,680, %T A284804 710,740,770,800,830,895,925,955,985,1015,1045,1110,1140,1170,1200, %U A284804 1230,1260,7990,8170,8350,8530,8710,8890,9280,9460,9640,9820,10000,10180,10570,10750 %N A284804 Fixed points of the transform A284803. %e A284804 310 is a term of the sequence because 310 in base 6 is 1234, its complement in base 3 is 4321 and the digit reverse is again 1234 that is 310 in base 10. %p A284804 P:=proc(q,h) local a,b,k,n; for n from 1 to q do a:=convert(n,base,h); b:=0; %p A284804 for k from 1 to nops(a) do a[k]:=h-1-a[k]; b:=h*b+a[k]; od; if b=n then print(n); fi; od; end: P(10^2,6); %Y A284804 Cf. A035928, A284803. %K A284804 nonn,base,easy %O A284804 1,1 %A A284804 _Paolo P. Lava_, Apr 03 2017